Security researchers have been warning about the threat from IoT devices for years! The massive deployment scale and utter lack of security make networked embedded devices (aka The Internet of Things) prime targets. As early as 2015, Stephen Ridley, now CTO at Senrio briefed the US government and intelligence community on IoT security - or rather the lack thereof (see excerpt in the box).
“We are just before the curve on embedded security. There are sparce product and service offerings in this area now simply because of the uncanny valley. We also haven’t yet experienced the big watershed event that will cause the reactionary security industry to shift focus - but that appears imminent.” Stephen Ridley briefing US government and Intelligence Agencies in early 2015